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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5e8c2be6a4556e00885f804bc35cf6126a00c13d56f33c95cbaa0956ccfcc8' 
  AND token = 'm3VI0aX15KcMab83s9CU/UocBw9ZqD+L/ea4jvrevLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}